JP2021092301A - Rotary composite body, such as sheet conveyance roller and drive transmission unit, and image formation device - Google Patents

Abstract

To solve a problem that processing of an outer diameter part of a shaft body may cause deformation and deterioration of run-out accuracy to the shaft body in a structure in which a rotary body is attached to the shaft body to be fixedly bonded thereto.SOLUTION: A rotary composite body has: a shaft body; and a rotary body which includes a hole part into which the shaft body is inserted and which is fixedly bonded to the shaft body by a bond to rotate integrally with the shaft body. At an inner diameter part of the hole part of the rotary body, first areas and second areas having radial rigidity higher than that of the first area are alternately disposed in a circumferential direction. In the first area, an opening part opening from the inner diameter part of the hole part of the rotary body to the radial outer side is provided. When the shaft body is inserted into the rotary body, an outer diameter of the shaft body and an inner diameter of each second area of the hole part of the rotary body are fitted. After the shaft body is inserted into the rotary body, the bond is injected into the opening part to fix the rotary body to the shaft body.SELECTED DRAWING: Figure 4

Description

The present invention relates to an image forming apparatus having a rotating complex such as a sheet transfer roller and a drive transmission unit.

Image forming devices such as copiers, printers, and facsimiles are provided with a sheet transport roller for transporting sheets, a drive transmission unit composed of gears and the like for transmitting drive. Generally, in a seat transfer roller or a drive transmission unit, a plurality of rotating bodies such as rollers and gears are fitted into a shaft body. Examples of fitting such parts include press-fitting, welding, and bonding with an adhesive. Among them, adhesion with an adhesive is common because a strong adhesive force can be obtained relatively easily.

According to Patent Document 1, one spiral groove portion extending in the axial direction is formed on the outer peripheral portion of one end portion of the shaft body, and a configuration in which an adhesive is stored in the groove portion is disclosed. Then, a rotating body such as a gear is fitted to the outer periphery of the shaft body via an adhesive, and the shaft body and the rotating body are adhered and fixed.

JP-A-2004-286121

However, in the configuration described in Patent Document 1, processing is performed on the outer periphery of one end of the shaft body in order to form one spiral groove for storing the adhesive. In this case, by processing the shaft body, there is a risk that the shaft body may be deformed or the runout accuracy may be deteriorated. In particular, when the outer diameter of the shaft is small or the length of the shaft in the axial direction is large, it is easily affected by the fixing of the shaft when machining the shaft and the cutting force during machining. Become.

In view of these, in the configuration in which the rotating body is inserted into the shaft body and fixed by adhesion, the present invention improves the accuracy of the position of the shaft body, the rotating body, and the rotating body without processing the outer peripheral portion of the shaft body. Is intended to be fixed to the shaft body.

In order to achieve the above object, the rotating composite of the present invention includes a shaft body and a hole portion to be inserted into the shaft body, and rotates integrally with the shaft body by being adhesively fixed by an adhesive. In a rotating composite having a rotating body, the inner diameter portion of the hole portion of the rotating body is such that a first region and a second region having a higher radial rigidity than the first region are formed in the circumferential direction. They are arranged alternately, and in the first region, openings are provided that open from the inner diameter portion of the hole portion of the rotating body toward the outside in the radial direction, and the rotating body is inserted into the shaft body. At that time, the outer diameter of the shaft body and the inner diameter of the hole portion of the rotating body in the second region are fitted, and after the rotating body is inserted into the shaft body, an adhesive is applied to the opening. It is characterized in that the rotating body is fixed to the shaft body by injecting.

According to the present invention, since the rotating body is inserted into the shaft body and then adhesively fixed, it is possible to improve the accuracy of the fixing position between the shaft body and the rotating body without processing the outer peripheral portion of the shaft body.

Sectional drawing of the image forming apparatus which concerns on embodiment of this invention External view of the sheet transfer roller of the first embodiment Explanatory drawing of assembly procedure of sheet transfer roller of Embodiment 1 Side view of the roller of the first embodiment Sectional drawing of sheet transfer roller of Embodiment 1 External view of the sheet transfer roller of the second embodiment Sectional drawing of sheet transfer roller of Embodiment 2 External view of the sheet transfer roller of the third embodiment External view of the drive transmission unit of the fourth embodiment External view of the drive transmission unit according to the fourth embodiment

[Embodiment 1]
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. In each drawing, the same reference numerals shall be given to equivalent members, parts and functions.

<Image forming device>
First, the image forming apparatus 100 provided with the sheet transport roller of the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view of an image forming apparatus including the sheet transport roller of the present embodiment. In the following description, the front surface (front surface, front side) of the image forming apparatus 100 is the front side and the back surface (rear surface, back side) of the paper surface of FIG. The left and right are left and right when the image forming apparatus 100 is viewed from the front. Up and down are up and down in the direction of gravity. The upstream side and the downstream side are the upstream side and the downstream side in the sheet transport direction.

Image information transmitted from an external connection cable (not shown) is processed by a controller (not shown). Further, a laser beam is emitted from the laser scanner unit 152 by a signal based on the processing result to form an electrostatic latent image on the photoconductor drum 151, and the electrostatic latent image on the photoconductor drum is developed by the developer 153. , A toner image is formed on the photoconductor. After that, a predetermined pressing force and an electrostatic load bias are applied by the primary transfer device 154, and the toner image is transferred onto the intermediate transfer belt 155. In the case of FIG. 1, the image forming unit 150 described above includes four sets of yellow Y, magenta M, cyan C, and black Bk.

Next, the intermediate transfer belt 155 will be described. The intermediate transfer belt 155 is conveyed and driven in the direction of arrow A in FIG. Therefore, parallel processing is performed by the Y, M, C, and Bk image forming devices described above. The image forming process of each color is performed at the timing of superimposing on the upstream toner image primaryly transferred on the intermediate transfer belt 155. As a result, a full-color toner image is finally formed on the intermediate transfer belt 155 and transferred to the secondary transfer unit 140.

On the other hand, the sheets S loaded on the cassette 111 are separated and fed one by one by the paper feeding unit 110. The fed sheet S is conveyed toward the sheet transfer roller pair 120 arranged on the downstream side, and then is conveyed to the sheet skew correction device 130 having the resist roller pair 131. After the skew of the sheet S is corrected by the sheet skew correction device 130, the sheet S is conveyed to the secondary transfer unit 140 by the transfer roller pair 120 and the resist roller pair 131.

A full-color toner image is secondarily transferred onto the sheet S in the secondary transfer unit 140 by the transfer process and the image forming process of the sheet S described above. After that, the sheet S is conveyed to the fuser 160. The fuser 160 melts and fixes the toner on the sheet S by applying a predetermined pressing force by a roller or a belt or the like substantially facing each other and a heating effect by a heat source such as a heater in general. The sheet S having the fixed image thus obtained passes through the transport unit 170 after fixing and is aligned on the paper ejection tray 180 installed in the body of the image forming apparatus 100 by the paper ejection roller pair 171. It is loaded while being loaded. When double-sided image formation is required, a route is selected as to whether or not the image is transferred to the reverse transfer device 190 by branching with the switching flapper 172.

<Sheet transfer roller>
Next, the sheet transfer roller 120a of the present embodiment will be described with reference to FIG. FIG. 2 is an external view of the sheet transport roller 120a. 2 (a) is a perspective view, FIG. 2 (b) is a front view, FIG. 2 (c) is a side view, and FIG. 2 (d) is a sectional view taken along line BB of FIG. 2 (c).

The sheet transfer roller pair 120 shown in FIG. 1 is composed of a sheet transfer roller 120a to be driven and input and a driven roller 120b (not shown). As shown in FIG. 2B, in the sheet transport roller 120a of the present embodiment, two roller rotating bodies 59 are symmetrically arranged on the roller shaft 1 which is a shaft body along the center line LC in the axial direction of the sheet transport roller 120a. Has been done.

The roller rotating body 59 is composed of a roller support 27 which is a rotating body and a rubber roller 6 which is a roller member. A rubber roller 6 is attached to the outer peripheral portion of the roller support 27, and the rubber roller 6 comes into contact with the sheet to convey the sheet. The rubber roller 6 and the roller support 27 can rotate integrally with each other, and are fixed so as not to be relatively out of phase in the rotation direction. Specifically, the roller support 27 is provided with an outer peripheral surface 9 in contact with the inner diameter surface 8 of the rubber roller 6, and the outer peripheral surface 9 is provided with a rubber roller 6 so as not to be out of phase with the rubber roller 6 in the rotational direction. A rib 10 having a height of h1 is provided to fix the above. Further, the rib 10 also serves to reinforce the strength of the roller support 27 and is formed along the axial direction. In the present embodiment, the roller rotating body 59 is inserted through the roller shaft 1 to form a sheet transport roller 120a which is a rotating complex.

Examples of the 27 materials of the roller support include synthetic resins such as polyacetal (POM), acrylonitol butadiene styrene copolymer (ABS), and polyethylene terephthalate (PET) to which a reinforcing material such as glass is added. Can be done. In this embodiment, POM is adopted.

Further, as the material of the rubber roller 6, it is used properly in consideration of the usage environment, conditions, durability and the like. For example, mainly ethylene propylene rubber (EPDM) material, urethane rubber, chloroprene rubber, acrylonitrile / butadiene rubber, and silicon rubber (mirable rubber) can be exemplified. Further, injection-moldable thermoplastic elastomers (TPEs), rubber compound silicone resins (liquid silicone rubbers), and the like can also be exemplified. In this embodiment, EPDM was adopted.

Both ends of the roller shaft 1 are rotatably supported by drive bearings (not shown). One end of the roller shaft 1 is provided with a gear, which is a drive transmission member (not shown) provided on the outer side of the drive bearing. Then, the gear is connected to a motor which is a drive source in order to receive a rotating driving force. Then, the seat transfer roller 120a is rotated by the rotational drive of the motor. On the other hand, the driven roller 120b (not shown) has a roller arranged so that the outer peripheral surface faces the rubber roller 6 of the roller rotating body 59 of the sheet transport roller 120a, and comes into contact with the rubber roller 6 at a predetermined pressure. When the drive is transmitted to the sheet transfer roller 120a, the sheet transfer roller pair 120 configured in this way causes the driven roller 120b to rotate driven by the rotation of the sheet transfer roller 120a. Then, the seat S (not shown) that has entered the nip of both rollers is sandwiched and conveyed by both rollers.

<Fixing the roller shaft of the sheet transfer roller and the roller rotating body>
Next, the fixing of the roller shaft 1 of the sheet transport roller 120a and the roller rotating body 59 will be described with reference to FIGS. 3, 4, and 5.

FIG. 3 is an explanatory view of an assembly procedure of the sheet transfer roller of the present embodiment. FIG. 4 is a side view of the roller rotating body 59 before assembly of FIG. FIG. 5 is a cross-sectional view taken along the line AA of the sheet transport roller 120a in FIG. 2B.

First, the assembly of the roller shaft 1 and the roller rotating body 59 will be described. As shown in FIG. 3, the roller support 27 of the roller rotating body 59 is provided with a hole portion 71 formed with a predetermined inner diameter, and the roller rotating body 59 is oriented in the arrow direction from both ends of the roller shaft 1. Is inserted into. The inner diameter φD5 of the hole 71 provided in the roller support 27 is set to a dimension in which the outer diameter φRd of the roller shaft 1 can be inserted, and the details will be described later. After each roller rotating body 59 is moved to a predetermined position 3 of the roller shaft 1, the roller shaft 1 and the roller rotating body 59 are adhesively fixed by an adhesive, so that the sheet transport roller 120a shown in FIG. 2 is formed. It is formed.

Next, the fixing of the roller shaft 1 and the roller rotating body 59 will be described in detail. As shown in FIG. 4, the roller support 27 is provided with a hole portion 71 which is a through hole through which the roller shaft 1 is inserted. Further, a lightening portion 11 extending in the circumferential direction is provided on the outer side in the radial direction from the center position of the hole portion 71. In the present embodiment, the lightening portions 11 are provided at four places. Specifically, in the roller support 27, a region a1 having no lightening portion and a region a3 of the lightening portion 11 are alternately arranged in the circumferential direction. Regarding the radial wall thickness of the roller support 27, when the region a1 is shown as t1 and the region a3 is shown as t3, the relationship between the wall thickness t1 and the wall thickness t3 is set to be in the equation (1). That is, the relationship between the radial rigidity G1 of the region a1 and the radial rigidity G3 of the region a3 is given by the equation (2).
t1> t3 (1)
G1> G3 (2)

Therefore, on the inner peripheral surface of the inner diameter φD5, the inner peripheral surface 15a region and the inner peripheral surface 16a are alternately provided in the circumferential direction. The inner peripheral surface 15a is a first region provided in the region a3 and having low rigidity in the radial direction. The inner peripheral surface 16a is a second region provided in the region a1 and having high radial rigidity. That is, in the radial direction, the inner peripheral surface 16a is more easily elastically deformed than the inner peripheral surface 15a. As a result, when the roller rotating body 59 is inserted through the roller shaft 1, the outer diameter portion of the roller shaft 1 presses the inner peripheral surface 15a. As a result, workability when the roller support 27 is inserted into the roller shaft 1 can be improved.

Next, the relationship between the outer diameter φRd of the shaft body 1 and the inner diameter φD5 of the roller support 27 will be described. In the present embodiment, when the roller rotating body 59 is inserted through the roller shaft 1, the roller shaft 1 and the roller rotating body 59 are lightly press-fitted while ensuring the coaxiality between the roller shaft 1 and the roller rotating body 59. ing. Therefore, the relationship between the inner diameter φD5 of the inner peripheral surface 15a and the inner peripheral surface 16a of the hole 71 and the outer diameter φRd of the roller shaft 1 is set as follows.

In the roller shaft 1 of the sheet transport roller in the image forming apparatus, the outer diameter of the roller shaft 1 is mainly φ6. Therefore, an example of a shaft having an outer diameter of φ6 will be described. The values of the outer diameter φRd of the roller shaft 1 and the inner diameter φD5 of the roller support 27 have a good relationship of “tightening fit” of the fitting tolerance. For example, when the outer diameter φRd of the roller shaft 1 is φ6k7 (+ 0.013 / −0.001), the inner diameter φD5 of the roller support 27 is set to φ6N8 (-0.002 / −0.02), and the formula ( The relationship is 3).
Minimum value of outer diameter φRd> Maximum value of inner diameter φD5 (3)

By setting as described above, when the roller shaft 1 is lightly press-fitted into the hole portion 71, the easily deformable inner peripheral surface 16a is deformed to the lightening portion 11 side, and the insertion resistance is reduced. On the other hand, since the inner peripheral surface 15a is not easily deformed, the insertion resistance is not reduced, but the position with the roller shaft 1 can be maintained. Further, in the present embodiment, since the lightening portions are provided at four places at equal intervals, when the roller rotating body 59 is inserted into the roller shaft 1, the roller rotating body 59 is connected to the roller shaft 1. Coaxiality can be ensured.

In this embodiment, the tolerance range between the roller shaft 1 and the roller support 27 is shown by the example of k7 and N8, but other than the relationship of "tightening fit" as in the above equation (3). The value of may be used.

As described above, when the roller support 27 is inserted into the roller shaft 1, the coaxiality between the roller support 27 and the roller shaft 1 can be ensured by the inner peripheral surface 15a. Further, the inner peripheral surface 16a allows the roller shaft 1 and the roller support 27 to be lightly press-fitted, and the roller support 27 can be held at the position 3 fixed to the roller shaft 1.

Further, an opening 81 extending radially outward from the center position of the roller shaft 1 is formed on the axial end surface of the roller support 27. As shown in FIG. 2D, the openings 81 are formed in a U-shape in the axial direction, and are provided at four locations in the circumferential direction, for a total of eight locations.

After the roller rotating body 59 is inserted into the roller shaft 1 and moved to the position 3 where it is fixed, an adhesive is applied to the opening 81 to apply an adhesive to the surface portion of the outer peripheral portion of the shaft body 1 and the opening portion of the roller rotating body 59. Is adhered and fixed to the surface of the.

As described above, in the configuration of the present embodiment, the inner diameter φD5 of the hole 71 of the roller support 27 having the outer diameter φRd of the roller shaft 1 and the elastic rubber roller 6 on the outer peripheral portion is lightly press-fitted. The relationship is "bame". Further, the hole portion 7 of the roller support 27 has an inner peripheral surface 15a which is a region a1 having high rigidity and an inner peripheral surface 16a which is a region a3 having low rigidity. Coaxiality is ensured between the inner peripheral surface 15a and the outer peripheral surface of the roller shaft 1, and the inner peripheral surface 16a and the outer peripheral surface of the roller shaft 1 are lightly press-fitted and moved to the fixing position 3. After that, the sheet transport roller 120a is formed by injecting an adhesive into the opening 81 that opens the outer peripheral surface of the roller shaft 1 in a U shape toward the outer peripheral surface 9 direction of the rotating body 27 and solidifying it.

Therefore, in the configuration of the present embodiment, the roller shaft 1 does not need to be shaped to fix the roller support 27, and may have a simple shaft shape. Further, since the opening 81, which is a space for the adhesive to enter, is formed between the roller shaft 1 and the roller support 27, the adhesive is stored in the opening 81, and the roller support 27 is the roller shaft 1. Is fixed to. Further, the outer peripheral portion of the roller shaft 1 is fitted with the inner peripheral surface 15a in a region having high rigidity in the radial direction of the roller support 27. Since the inner peripheral surfaces 15a are arranged at three or more places at equal intervals in the circumferential direction and are formed so as to be in contact with the outer peripheral surface of the roller shaft 1, a plurality of inner circumferences formed on the roller support 27 are formed. The surface 15a is held toward the center of the roller shaft 1. That is, while the coaxiality with the central axis of the roller shaft 1 is guaranteed, the position with respect to the roller shaft 1 is maintained until the adhesive solidifies, so that stable fixing can be obtained.

[Embodiment 2]
The second embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is an external view of the sheet transport roller 120a of the second embodiment. FIG. 6A is a perspective view of the roller support 28 inserted into the roller shaft 1. 6 (b) is a front view, FIG. 6 (c) is a side view, and FIG. 6 (d) is a sectional view taken along line BB of FIG. 6 (c). FIG. 7 is a cross-sectional view taken along the line AA of the sheet transport roller 120a of FIG. 6B.

The components equivalent to those in the first embodiment are indicated by the same reference numerals. In the first embodiment, the roller shaft 1 has an opening 81 that opens the outer peripheral surface of the roller shaft 1 in a U shape toward the outer peripheral surface 9 direction. In the second embodiment, the injected adhesive is prevented from flowing out from the axial opening portion of the U-shaped roller shaft 1 of the opening 81 before solidifying. Therefore, the opening 82 that opens the outer peripheral surface of the roller shaft 1 in a round shape toward the outer peripheral surface 9 direction is arranged at the central portion of the roller shaft 1 of the rotating body 28 in the axial direction. Further, the openings 82 are arranged in regions a3 (4 locations in the present embodiment) having low rigidity in the circumferential direction, and the outer peripheral direction of the openings 82 is equal to or larger than the round shape of the openings 82. An adhesive injection hole 82a, which is a through hole having a large shape, is provided.

The method of fixing the roller shaft 1 and the roller support 28 and the accuracy of the coaxial cable are the same as those in the first embodiment and will be omitted.

Next, the procedure for injecting the adhesive will be described. As shown on the right side of FIG. 6A, the roller rotating body 60 having the rubber roller 6 attached to the outer peripheral surface of the rotating body 28 is adhesively fixed to the roller shaft 1. In this case, after the roller rotating body 60 is inserted into the roller shaft 1 and positioned, an adhesive is injected into the opening 82 via the lightening portion 11 to solidify and bond the roller rotating body 60. On the other hand, after the rotating body 28 in the state before the rubber roller 6 is applied, which is shown on the left side of FIG. 6A, is adhered and fixed to the roller shaft 1, the outer peripheral surface of the rotating body 28 is covered with the rubber roller 6. In this case, after the rotating body 28 is inserted into the roller shaft 1 and positioned, the adhesive is injected into the opening 82 through the adhesive injection hole 82a, and the rotating body 28 is solidified and adhered. After that, the outer peripheral surface 9 of the rotating body 28 adhered to the roller shaft 1 is covered with the rubber roller 6 to complete the roller rotating body 60.

As described above, since the opening 82 into which the adhesive is injected is surrounded by the wall thickness t3 of the region a3 in which the radial rigidity of the roller shaft 1 is low, it is possible to prevent the roller shaft 1 from flowing out in the axial direction.

[Embodiment 3]
The third embodiment will be described with reference to FIG. FIG. 8 is an external view of the sheet transport roller 120a of the third embodiment. FIG. 8A is a perspective view of the roller support 29 inserted into the roller shaft 1. 8 (b) is a front view, FIG. 8 (c) is a side view, and FIG. 8 (d) is a sectional view taken along line BB of FIG. 8 (c). The cross section of the sheet transport roller 120a of FIG. 8B is the same cross-sectional view as that of FIG. 7.

The components equivalent to those of the first embodiment and the second embodiment are indicated by the same reference numerals. In the second embodiment, the rotating body 28 has an opening 82 arranged at the center of the roller shaft 1 in the axial direction and an adhesive injection hole 82a. In the third embodiment, the opening 83 is provided at a position centered on the end of the rubber roller 6 in the axial direction of the roller shaft 1. The opening 83 has a round shape from the outer peripheral surface of the roller shaft 1 toward the outer peripheral surface of the rubber roller 6. The roller support 29 is provided with an adhesive injection hole 83a, which is a through hole having a shape equal to or larger than the round shape of the opening 83 in the direction of the outer peripheral surface of the opening 83.

The method of fixing the roller shaft 1 and the roller support 29 and the accuracy of the coaxial cable are the same as those in the first and second embodiments, and will be omitted.

Next, the procedure for injecting the adhesive will be described. As shown on the right side of FIG. 8A, the roller rotating body 61 having the rubber roller 6 attached to the outer peripheral surface of the rotating body 29 is adhesively fixed to the roller shaft 1. In this case, after the roller rotating body 61 is inserted into the roller shaft 1 and positioned, an opening is provided through a semicircular side that is not blocked by the axial end of the roller shaft 1 of the rubber roller 6 of the adhesive injection hole 83a. An adhesive is injected into 83 to solidify and bond it.

On the other hand, when the roller support 29 in the state before the rubber roller 6 is applied, which is shown on the left side of FIG. 8A, is adhered and fixed to the roller shaft 1, and then the outer peripheral surface 9 of the roller support 29 is coated with the rubber roller 6. Since the procedure is the same as that of the second embodiment, the description thereof will be omitted.

Although the procedure for injecting the adhesive has been described above, there is no problem in injecting the adhesive into the opening 82 through the lightening portion 11 as in the second embodiment.

[Embodiment 4]
The fourth embodiment will be described with reference to FIGS. 9 and 10. 9 (a) is a perspective view of the drive transmission unit 121b, FIG. 9 (b) is an arrow view of FIG. 9 (a) (axis body 1 is not shown), and FIG. 9 (c) is a side view and FIG. 9 (c). d) is a cross-sectional view under the same conditions (same cross-sectional line position) as the cross-sectional view described in the first embodiment.

Instead of the rubber roller 6, the gear rotating body 62 having the gear teeth 6a attached to the outer periphery of the rotating body 30 is attached to the shaft body 1 by the above-mentioned means. As a result, the drive transmission unit 121b, which is a rotational complex, is formed.

In FIG. 10, the rotating body 30 and the gear tooth portion 6a are integrated to form the gear rotating body 63. Therefore, by attaching the gear rotating body 63 to the shaft body 1 by the above-mentioned means, the drive transmission unit 121b that transmits the drive is formed.

Since the inner diameter portion 73 of both the gear rotating bodies 62 and 63 is the same as that of the rotating body 29, the same effect as that of the third embodiment can be obtained.

Although each embodiment has been described above, the scope of application of the configuration according to the present invention is not limited to these embodiments, and can be applied to a composite of a shaft body and parts attached to the shaft body. For example, there are a paper feed roller, a resist roller 131, a paper discharge roller pair 171 and a reversing roller pair 173 of the paper feed unit 110. Further, in the present embodiment, the rotating bodies 2 are provided at two places in the axial direction, but one place or a plurality of other places may be used. Further, in the present embodiment, four openings for injecting the adhesive are provided in the second embodiment, and eight openings are provided in the first, third, and fourth embodiments, but one or a plurality of other openings. It may be in a place. Further, it is not necessary to inject the adhesive into all the openings, and the number of openings into which the adhesive is injected may be determined according to the required adhesive force of the shaft body 1 and the rotating body 2 so as to satisfy the adhesive force. Furthermore, the present invention is not limited to the above configuration, and if the functions are the same, it can be applied to other cases, there is no problem, and the same effect can be obtained.

120a, 121b Rotating complex 1 Roller shaft (shaft body)
2, 27, 28, 29, 30 Roller support, gear support (rotating body)
59, 60, 61 Roller rotating body 62, 63 Gear rotating body 6 Rubber roller (roller member)
6a Gear teeth 71, 72, 73 Inner diameter (hole)
11 Lightening portions 15a, 16a Inner peripheral surfaces 81, 82, 83 Openings 81a, 82a, 83a Through holes t1, t3 Wall thickness a1 Area with high radial rigidity a3 Area with low radial rigidity G1, G3 Radial direction Rigidity

Claims (8)

A rotating composite having a shaft body and a rotating body having a hole to be inserted into the shaft body and rotating integrally with the shaft body by being adhesively fixed by an adhesive.
In the inner diameter portion of the hole portion of the rotating body, a first region and a second region having higher rigidity in the radial direction than the first region are alternately arranged in the circumferential direction.
In the first region, an opening is provided that opens outward in the radial direction from the inner diameter portion of the hole portion of the rotating body.
When the rotating body is inserted into the shaft body, the outer diameter of the shaft body and the inner diameter of the hole portion of the rotating body in the second region are fitted.
After the rotating body is inserted into the shaft body, the rotating body is fixed to the shaft body by injecting an adhesive into the opening.
A rotating complex characterized by. When the rotating body is inserted into the shaft body, the outer diameter portion of the shaft body presses the first region and the first region is elastically deformed.
The rotating complex according to claim 1. The rotation according to claim 1 or 2, wherein the opening is provided on an axial end surface of the shaft body of the rotating body and is arranged at at least one place or more. Complex. The rotation composite according to claim 1 or 2, wherein the opening is provided at the central portion of the rotating body in the axial direction of the shaft body, and is arranged at at least one place or more. body. It also has a roller member that comes into contact with the sheet and conveys it.
The rotating body supports the roller member and rotates integrally with the roller member to form a sheet transport roller.
The rotating complex according to any one of claims 1 to 4. Further has a gear for transmitting the driving force from the driving source,
The rotating body supports the gear and rotates integrally with the gear to form a drive transmission unit.
The rotating complex according to any one of claims 1 to 4. The opening is characterized in that it is arranged so as to overlap both the rotating body and the roller member provided on the outer periphery of the rotating body or the axial end portion of the shaft body of the gear. The rotating complex according to claim 5 or 6. The rotational complex according to any one of claims 1 to 7.
An image forming apparatus comprising: an image forming portion for forming an image on a sheet conveyed by the rotating complex.

Images